Precise Requirements (C) is a framework for requirements specification and modelling. With a framework we can develop more structured and consistent requirements. This is very important in Agile development where requirements are developed and specified progressively. Plus, a framework for requirements helps making requirement repository a single source of truth for both development and verification, as well helps keeping the team's focus on the product.
It is often to see using task/issue tracking tools for managing requirements, those tools provide no framework for requirements modelling. We need a simple yet powerful requirements modelling tool that can facilitate requirement process including elicitation and consolidation of requirements, and can help develop structural models that are easy access for development and testing.